mardis



P. L. MARDIS.

RELAY.

APPLICATION FILED IuLY 6.19II.

Patented Sept. 2,1919.

INVENTOR AITORNEY UNITED STATES PATENT oEEIoE.

PAUL L. MARDIS, O F WILKINSBURG, PEN'NSYLVANIA, ASSIGNOB. TO-WESTNGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

RELAY.

' y' specification of Letters-Patent:

I To all'wkom it may concern:

Be it known that I, PAUn L. MARDIS, a citii. zen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, yhave invented a new and useful. Improvement in Relays, of which the'following is a specification.

My invention' relates Lto electromagnetic devices and particularly to relays for protecting electric circuits. Y l' One object of my invention is to provide a relay that. shall have electromagnetic means for holding its armature in its actuated position.

Another object of my invention is to provide a relay of the above indicated character that shall be ineipensive to construct Aand efficient in its operation.

My No. 148,431, filed -February 13, 1917, discloses a` system of control for electric vehicles in which the -overload tripping device 4is electromagnetically held inv its tripping position" in accordance with predetermined -conditions in the circuit.

In my present invention, I provide an overload relay' of the above indicated character that has la pivotally-mounteddouble armatureone portion of which is ladapted to actuate the contact membersv and the other portion ofwhich isa-dapted to be electromagnetically vheld in` its actuated positlon underpredetermined conditions.

In the accompanying drawings, Figure 1 is a front elevational view of a relay embodying my invention, and-F ig. 2 is a dia- I grammatic view of an electrical circuit em- `bodyin the relay shown in Fig. 1.

. on, is mounted on a supporting member or A re ayLcomprising a frame member 1, having a m'agnetizable 'core portion 2 therepanel board 3. `Stationary contact members 4, 5, 6 and 7 are mounted on the board 3 andare adapted to be engaged by bridgingcontact members 8 and 9. l'lhecorelportion 2 of the frame 1a has an openingllO therethrough in which is loosely disposed a rod `11. The bridging contact members 8 and 9 are mounted on the rod 11, and a spring 12 is disposed between a projection 13 onf the framel and the bridging member 8 for the purpose of normally holding the rod 11 in such position that a collar 13, which is mounted thereon, normally engages the core portion 2. A winding 14 is disposed copending patent application Serialaround the core portion.2 and isprovided i'- i with terminal members 15 for securing line conductors thereto.

An armature 16 is mounted on a pin 17 on the-.frame 1a, and is provided with two arms 18 and 19 the arm 18 of which is adapted to engage thelower end 20 of the rod 11 Patented sept. 2, 1919..

when suificient current traverses the winding 14 to move the armature 16 upwardly. The

arm 19 is adapted to engage a stationary core member 21 when' the armature is in its actuated position and to be hel-d in this position by reason of the energization of a ywinding 22l that surrounds the core member 29. A conductor 31 is connected to the collecting device 28 and to one terminal 32 of a line switch 33, the other terminal 32 of which is connected, through va series of resistors 34, to one terminal of thewinding` 14. The other terminal of the winding 14 is connected `to one terminal 'of the armature of the motor 27. The other terminal ofthe armature of the motor 27 is connected through lits series fieldv windin-g 35 to a ground conductor 30.' A resistor 36 is connected between the collecting device 28 and a ground conductor 37. '.A'conductor l38 `is connectedv from an intermediatepoint of the resistor 26 to the stationary contact members 4 and `6 of the overload relay 1. The ystationary contact member '7 of the relay is connected to one terminal of the winding '39 of the line switch 33, the 'otherterininal of which is connected to one terminal 49 ofthe holdinlgwinding 22.. The .othe'r terminal of thev 'winding 22 is connected to r"thestationary contact member 5 of the overload relay 1.

A controller 41 is adapted to-control the connection of the resistors 34 in the circuit of the armature of the motor 27 and is'p'rovided with an interlock contact member 42 that is adapted to engage stationary contact Amembers 43 when the same is in its initial `position 6a. That is, the initial' starting step of the controller causes the interlock contact member 42 to engage the contact members 43 which are connected to two conductors 44 and 4'5. The conductor 44 is connected to `an auxiliaryl stationary contact member 46 of the line switch 33 and the lconductor 45 is connected to an auxiliary stationary contact. member 47 of the line switch 33. The conductor44 is connected also to the ter-minal of the Winding Q2 and the conductor is connected also to the ground Conductor 37. An auxiliary bridging contact member 48 is adapted to engage the .auxiliary stationary contact members 46 and 47 when the line switch is in its'closed position. v

When .the controller 41 is moved to4 its initial position ya and the overload relay is in its normal position, a circuit is comf pleted through the conductor 38, the bridging contact member 9', the winding 39 of the linexswitch 33, the conductor 44, the interlock contact members 42 and 43 and the conductor- 45 to the ground conductor 37, thus causing the line Switch' 33 to be closed and the motor 27 to be started. The closing of the line switch causes the contact Y :members '46, 47 and 48to be engaged and thus maintain to its ZJ position or some other position in which'the interlock contact member 42 is disengaged from the stationary contact .members 43. Under` this condition, if an overload obtains on lthe motor 27, the-armature 16 of-ftheoverload relay will be drawn upwardly, and the bridging contact member 9 will be disengaged from the stationary contact members 6 and 7, thereby open-circuiting the winding-39 and completing 'the circuit through the holding winding 122.

Since the controller 41 is notA in its position a when the winding 39 isy denergized, and, consequently, rthe interlock contact member 42iS not in engagement with the Contact tion. Thus, the

'closed until the controller 41 is returned to .1ts1n1t1al position a.

members 43, and, since the contact members` 46, 47 Aand 48 are-disengaged, theholding winding 22 will permit the armature 16 to be returned to its initialposition and the overload relay to assumeits normal posiline switch 33 cannot be re- I do not limit my invention to the particular application described nor to the particular structure illustrated, as it may be variously modified without* departing from the spirit and scope of the invention, as set forth in the appended claims.

I claim as my invention:

1. A relay comprising a stationary mag- 'a complete circuit through the winding 39 when the controller is moved netizable member having an opening therethrough, a winding therefor, a contact-carrymg rod disposed in the opening, a ivoted double armature one portlon of w ich is adapted to be attracted by the .magnetizable member-to yac'tuate the rod, and an electromagnetic means for lcoperatin with the other portion of the armature or holding the rod in its actuated position Aunder predetermined conditions.

2. A relay -comprising a stationary magnetizable member having an opening therethrough, a windin therefor, a contact-carryingf'rod dispose in the opening, a pivoti:1:3331 mounted armature for actuating the and electro-magnetic means for holding sol through, a winding therefor, a rod eXtend ingthrough the opening, contact members mounted on the rod, a pivotally mounted armature having two arms one of which is adapted to actuate the rod, and an electromagnet for attracting the other arm of the armature.

5.1 Afrelay comprising a stationary mag- 'netizable member having anopeningthere- .l through, a winding therefor, a rod eXtend` .ing through the opening, contact members mounted on the rod, a pivotally mounted armature having tWo- 'arms disposed substantially at' .right angles' with .respect to eachother, one of which is adapted to actuate the rod, and electromagnetic meansi'or -coperating with the other anni to restrain the-armature in Aits actuated position. 6. An electromagnetic device comprising a stationary magnetizable frame having a core portion thereon with an opening therethrough, a winding for the core portion. a rod-loosely disposed in the opening, contact members resiliently mounted on the rod, a pivotally mounted armature mounted on the frame for actuating the rod, and an electromagnet mounted beneath the core portion for coperating with a portion of the armature to hold the same in its actuated position.

In testimony whereof, I have hereunto subscribed my name this 27th day of June PAUL L. MARDIS. 

